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Timing cover bolts...

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Timing cover bolts...
#1
drewb Avatar
drewb Drew Bertola
Khan Daun Penh, Phnom Penh, Cambodia   KHM
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1979 MG MGB
Hi all,

'79 MGB with a Moss Supercharger.

I had a timing cover bolt shear off. Can anyone tell me the size and thread of the bolt. I may need to ship one here to Cambodia.


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Re: Timing cover bolts...
#2
MGB567 Avatar
MGB567 Barrie Braxton
Ninderry, KabiKabi country, Queensland, Australia   AUS
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1966 MG MGB MkI "Money Guzzler"
1979 MG MGB GT V8 Conversion "Darkside"
Click on #37 here and decide.


Mk1: CKD 11/66 first registered 8/5/67; owned since 3/77. 18GB +40 balanced. Peter Burgess BVFR head. Piper 285. 123. FidanzaFW. 4synch c/r box. Lots more as I did a nut and bolt rebuild; finished 2015. Tartan Red.

GT: December '78. VW Golf guards, flush fit front and rear valances. Torana XU1 vents, frenched indicators & Mk1 rear lights. 'Worked' Rover V8 with Monsoon ECU for EFI. GM4L60E, Lokar tiptronic & Quick4 controller. Vintage Air A/C. FC IFS. CCE 4 link rear. Salisbury with Quaife. Jaguar Storm.

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Re: Timing cover bolts...
#3
drewb Avatar
drewb Drew Bertola
Khan Daun Penh, Phnom Penh, Cambodia   KHM
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1979 MG MGB
They don't give the sizes.

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Re: Timing cover bolts...
#4
Arizona Shorty Avatar
Arizona Shorty Greg McC
Prescott, AZ, USA   USA
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1968 Jeep CJ-5
1975 Yamaha MC RD350
1977 MG MGB
1985 Jeep CJ-7
Probably 1/4"x28 pitch. Also called 1/4" SAE fine. Length would be about 1/2". But a bit longer won't hurt anything.


GMc


Wait for me at the gate Tuffy, because without you they're never gonna let me in.

SDCH WTCH-X Twin Oaks Tuff Nutt
2008 - 2022

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Re: Timing cover bolts...
#5
andy1965MGB Avatar
andy1965MGB Silver Member Andy Lincoln
San Diego, CA, USA   USA
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1965 MG MGB "Blue Jay"
1967 MG MGB GT "Cardinal"
1995 MG RV8 "Shrek"
1998 MG MGF "Fiona"
If you follow the ordering page, you will see that Moss Europe calls out three different parts (depending on exact location for item 37)

Moss Europe PN QTY Spec
SH604031 3 1/4" UNF x 3/8"
GHF117 2 1/4" UNF x 3/4"
GHF120 4 5/16" UNF x 3/4"

There's nothing special about these screws, you could get them from any US-UK supplier that has UNF bolts and nuts. These only need to be grade 5 but you could get grade 8 also for more universal application.

or else perhaps when you order your next MG parts you include a small number of the standard sizes to amortize your shipping.
1/4" UNF x 3/8, 1/2, 3/4, 1"
5/16" UNF x 3/8, 1/2, 3/4, 1"
And some nuts and some split washers

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Re: Timing cover bolts...
#6
drewb Avatar
drewb Drew Bertola
Khan Daun Penh, Phnom Penh, Cambodia   KHM
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1979 MG MGB
So, I found the superchargers BOM and it calls out 1/4-28 X 2 1/4 in. (flat head allen screw)

This is what sheared. 3 of them hold a bracket to the timing cover with some spacers used in between the bracket plate and the timing cover. The bracket supports 2 additional idler pulleys as well as providing a connection point for the SC's nose bracket.

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Re: Timing cover bolts...
#7
MGB567 Avatar
MGB567 Barrie Braxton
Ninderry, KabiKabi country, Queensland, Australia   AUS
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1966 MG MGB MkI "Money Guzzler"
1979 MG MGB GT V8 Conversion "Darkside"
In reply to # 4785209 by drewb They don't give the sizes.

Oh yes they do! I wouldn't link if they didn't. You didn't say that your timing cover bolts were replaced for supercharger purposes. Sorry I wasted my time.


Mk1: CKD 11/66 first registered 8/5/67; owned since 3/77. 18GB +40 balanced. Peter Burgess BVFR head. Piper 285. 123. FidanzaFW. 4synch c/r box. Lots more as I did a nut and bolt rebuild; finished 2015. Tartan Red.

GT: December '78. VW Golf guards, flush fit front and rear valances. Torana XU1 vents, frenched indicators & Mk1 rear lights. 'Worked' Rover V8 with Monsoon ECU for EFI. GM4L60E, Lokar tiptronic & Quick4 controller. Vintage Air A/C. FC IFS. CCE 4 link rear. Salisbury with Quaife. Jaguar Storm.



Edited 1 time(s). Last edit at 2024-04-15 06:44 AM by MGB567.

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Re: Timing cover bolts...
#8
John37 Avatar
John37 John M
Abingdon, Oxfordshire, UK   GBR
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1978 MG MGB GT
Getting the remains out can be a big problem. I've had success with left hand drills. Use a small size first to make a pilot hole then go up a step. The larger drill bites into the bolt and unscrews it.


John
1978 MGB GT UK spec

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Re: Timing cover bolts...
#9
Soling2003 Avatar
Soling2003 Gary M
Pahoa, HI, USA   USA
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1969 MG MGB MkII
Or an easy out

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Re: Timing cover bolts...
#10
andy1965MGB Avatar
andy1965MGB Silver Member Andy Lincoln
San Diego, CA, USA   USA
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1965 MG MGB "Blue Jay"
1967 MG MGB GT "Cardinal"
1995 MG RV8 "Shrek"
1998 MG MGF "Fiona"
Drew,

I'm with Barrie, you've got to help us to help you--we are all volunteers here. Barrie and I honestly thought you needed to replace the standard screws for the timing cover, not being told they were part of your supercharger setup. Your car had a supercharger but that wasn't obviously related to your problem.

If you'd said, "I've got these sheared bolts which are about 50 mm long + whatever is broken off, but I can't tell the bolt diameter or thread" then we would have been able to help by saying they are probably 1/4" UNF but might be 5/16" UNF then you would have been able to measure the bolt shank diameter and decide for yourself they must be 1/4" UNF.

Or "I've got broken bolts which are 1/4" diameter but I don't know if they ​are fine or coarse thread", then we could have easily told you fine thread.

You've got to help us to help you

Andy

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Re: Timing cover bolts...
#11
ClayJ Avatar
ClayJ Silver Member Clay Johnston
Mt. Olive, MS, USA   USA
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1972 MG MGB
Those mounting points for the idler seem to be a weak point with the early SC units. Might warrant a very strong bolt.

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Re: Timing cover bolts...
#12
riley1489 Avatar
riley1489 Gold Member Bruce H
Great White North, QC, Canada   CAN
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1953 Jaguar XK120
1959 Riley 1.5 "King George"
1973 MG MGB
In reply to # 4785229 by MGB567 You didn't say that your timing cover bolts were replaced for supercharger purposes. Sorry I wasted my time.


In reply to # 4785412 by andy1965MGB I'm with Barrie, you've got to help us to help you--we are all volunteers here. Barrie and I honestly thought you needed to replace the standard screws for the timing cover, not being told they were part of your supercharger setup. Your car had a supercharger but that wasn't obviously related to your problem.
If you'd said, "I've got these sheared bolts which are about 50 mm long + whatever is broken off, but I can't tell the bolt diameter or thread" then we would have been able to help by saying they are probably 1/4" UNF but might be 5/16" UNF then you would have been able to measure the bolt shank diameter and decide for yourself they must be 1/4" UNF.
Or "I've got broken bolts which are 1/4" diameter but I don't know if they ​are fine or coarse thread", then we could have easily told you fine thread.
You've got to help us to help you
Andy


Com'n chaps, read the initial post! winking smiley

B


Life's most persistent and urgent question is, "What are you doing for others?"



Edited 1 time(s). Last edit at 2024-04-15 03:54 PM by riley1489.

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Re: Timing cover bolts...
#13
MGB567 Avatar
MGB567 Barrie Braxton
Ninderry, KabiKabi country, Queensland, Australia   AUS
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1966 MG MGB MkI "Money Guzzler"
1979 MG MGB GT V8 Conversion "Darkside"
"Com'n chaps, read the initial post!"

But I did read the initial post. Not having a supercharged B I was not aware that it utilised existing timing cover bolt holes with supercharger specific screws. Had I known that then I would have added I knew nothing about the length but my link did give diameter and pitch. As Andy wrote "help us to help you" which is a reasonable call.


Mk1: CKD 11/66 first registered 8/5/67; owned since 3/77. 18GB +40 balanced. Peter Burgess BVFR head. Piper 285. 123. FidanzaFW. 4synch c/r box. Lots more as I did a nut and bolt rebuild; finished 2015. Tartan Red.

GT: December '78. VW Golf guards, flush fit front and rear valances. Torana XU1 vents, frenched indicators & Mk1 rear lights. 'Worked' Rover V8 with Monsoon ECU for EFI. GM4L60E, Lokar tiptronic & Quick4 controller. Vintage Air A/C. FC IFS. CCE 4 link rear. Salisbury with Quaife. Jaguar Storm.

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Re: Timing cover bolts...
#14
drewb Avatar
drewb Drew Bertola
Khan Daun Penh, Phnom Penh, Cambodia   KHM
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1979 MG MGB
Yeah, I needed the thread size. That didn't change with the SC install.

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Re: Timing cover bolts...
#15
SHIMHEAD Avatar
SHIMHEAD David Fogle
Summerville, SC, USA   USA
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1976 MG MGB
Simple method to determine bolt size. Simply take an open end wrench and slip over bolt shank, preferably a threaded section (may NOT fit over non-threaded bolt shank, but will be close). 5/16"open end fits over 5/16" threads, 1/4"wrench fits over 1/4" threads. Thread pitch is UNF fine threads. Length is remaining bolt length plus 1/4" to 3/8" to get close, or simply add length of extracted piece once it's out.


"We the willing, led by the unknowing, are doing the impossible for the ungrateful. We have done so much with so little for so long, that we are now qualified to do anything with nothing." source unknown....

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